https://doi.org/10.1007/s100510050247
On the origin of surface states in a correlated local-moment film
Humboldt-Universität zu Berlin, Lehrstuhl
Festkörpertheorie, Invalidenstraße 110, 10115 Berlin, Germany
Corresponding author: a nolting@physik.hu-berlin.de
Received:
22
September
1997
Revised:
12
December
1997
Accepted:
15
December
1997
Published online: 15 March 1998
The electronic quasiparticle structure of a ferromagnetic local moment film is
investigated within the framework of the s-f model. For the special case of a
single electron in an otherwise empty energy band being exchange coupled to a
fully ordered localised spin system the problem can be solved exactly and,
for the
spin-
electron, some marked correlation effects can be found. We
extend our model to incorporate the influence of the
surface on the electronic structure.
Therefore we modify the hopping integrals in the vicinity of the
surface. This leads to the existence of surface states, both for the
spin-
and the spin- spectral density of states. The
interplay between the modification of the hopping integrals and the existence
of surface states and correlation effects is discussed in detail.
PACS: 75.70.-i – Magnetic films and multilayers / 73.20.At – Surface states, band structure, electron density of states / 75.50.Pp – Magnetic semiconductors
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1998
